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In a class there are 27 students. knowing that the number of girls represents 80% of the number of boys, how many girls are in the class
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The hawaiian alphabet has 12 letters. how many permutations are posible for each number of letters?
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The jewelry store is having a sale. necklaces that were regularly priced at $23.50 are on sale for $18.80. what is the percentage of decrease in the price of necklaces?
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